a term of polite rejection used by prospective employers, girlfriends and perhaps other people whose approval you seek. It generally means "I really don't give a crap, but objectively speaking, I suppose it's possible that someone else might."

A pejoritive for the phrase "go down on him/her" ... In replace of "to give oral pleasure to"

My girlfriend doesn't appreciate me...
Doesn't everyone wish they got a little more appreciation now and then....
Maybe if you appreciated her more you'd get a little more respect...(see definition of "respect" by Murray)